These guys suck! buyer beware. They send me the wrong coil. Then don't respond for days so I bought the right coil. But they docked my return amount $ for opening it! They sent me the wrong part! Don't buy from this company.

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OEM ignition coil functions same as the original - pleasedby Walter from Wilmington, New York on November 05, 2011

I tightened the contact nut witha nut driver with just a few pounds of force and the lug busted off. Come to find out the lugs are hollow and paper thin. I emailed cust service with no response. Bought a new name brand coil threw this away, what a piece of junk. Will not order from I Boats again.

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Q:

How many ohms internal resistance does the coil have?

A:

The technicians at Sierra have said that it is an external resistance coil, and that it has no internal ohm resistance. If you have any further questions contact us at the number at the top of the page.

My 1985 3.0 mercruiser does not have an external resistor, is this the right coil?

A:

The technicians at Sierra have affirmed that all of the 3.0 Mercruiser engines from that year should have an external resistor. If yours does not, then you will want to consult a Mercury dealer for guidance on what to get. Because all of the information we have on this motor points to this ignition coil working for it.